package com.jhy.thread.ch3;


import java.util.Random;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * Created by rain on 2017/6/30.
 */
public class ReadWriteLockDemo {
    private static Lock lock = new ReentrantLock();

    private static ReentrantReadWriteLock readWriteLock = new ReentrantReadWriteLock();

    private static Lock readLock = readWriteLock.readLock();
    private static Lock writeLock = readWriteLock.writeLock();

    private int value;

    public Object handleRead(Lock lock) throws InterruptedException {
        try {
            lock.lock();
            Thread.sleep(2000);
            return value;
        } finally {
            lock.unlock();
        }
    }

    public Object handleWrite(Lock lock, int index) throws InterruptedException {
        try {
            lock.lock();
            Thread.sleep(2000);
            return index;
        } finally {
            lock.unlock();
        }
    }

    public static void main(String[] args) {
        final ReadWriteLockDemo demo = new ReadWriteLockDemo();

        Runnable readRunnable = new Runnable() {

            @Override
            public void run() {
                try {
                    demo.handleRead(readLock);
//                    demo.handleRead(lock);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };

        final Runnable writeRunnable = new Runnable() {

            @Override
            public void run() {
                try {
                    demo.handleWrite(writeLock, new Random().nextInt());
//                    demo.handleWrite(lock,new Random().nextInt());
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };


        for (int i = 0; i < 18; i++) {
            new Thread(readRunnable).start();
        }

        for (int i = 0; i < 18; i++) {
            new Thread(writeRunnable).start();
        }
    }

}
